Staff Member

Could you enable the "Enable Sender Rewriting Scheme (SRS) Support" option in "WHM >> Service Configuration >> Exim Configuration Manager >> Basic Editor" and let us know if this helps to address the issue?

This option rewrites sender addresses so that the email appears to come from the forwarding mail server. This allows forwarded email to pass an SPF check on the receiving server.

Staff Member

The message header suggests the email is routed through the SendGrid service. Is this something you have configured, or is it possible your data center is relaying your email through SendGrid? If it's something you have configured, you may want to review their documentation at the URL below to setup DKIM/SPF/DMARC records:

The problem was not the DMARC, it was the default whitelabel in sendgrid .. I've configured a default whitelabel in his control painel and it was the problem .. I've just removed it and my emails is been delevery without any problem